Q2. (a) describe the differences in chemical bonding that can be used to distinguish a semi-bridging h2-co ligand from a symmetrical 12-co ligand? (5 marks) (b) explain why the v- o stretching frequency changes when bis(acetylacetonato)oxovanadium(iv) is dissolved in pyridine. (4 marks) (c) the interaction of na fe(co), with (ch3)2nch i gives the carbene complex (co) fechn(ch3)2. write a plausible reaction sequence. (8 marks)

Select the correct value for the indicated bond angle in each of the compounds. o−o−oo−o−o angle of o3 90° 109.5° < 109.5° 120° < 120° 180° f−b−ff−b−f angle of bf3 180° < 109.5° < 120° 120° 109.5° 90° f−o−ff−o−f angle of of2 < 120° 120° 90° 109.5° 180° < 109.5° cl−be−clcl−be−cl angle of becl2 90° 109.5° 180° 120° < 109.5° < 120° f−p−ff−p−f angle of pf3 90° 109.5° < 109.5° 180° 120° < 120° h−c−hh−c−h angle of ch4 90° < 109.5° 180° 120° < 120° 109.5°